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Title: Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei

Abstract

It is shown that A. Bohr's concept of transition fission states can be matched with the properties of Coriolis interaction if an axisymmetric fissile nucleus near the scission point remains cold despite a nonadiabatic character of nuclear collective deformation motion. The quantum and thermodynamic properties of various stages of binary and ternary fission after the descent of a fissile nucleus from the outer saddle point are studied within quantum-mechanical fission theory. It is shown that two-particle nucleon-nucleon correlations--in particular, superfluid correlations--play an important role in the formation of fission products and in the classification of fission transitions. The distributions of thermalized primary fission fragments with respect to spins and their projections onto the symmetry axis of the fissile nucleus and fission fragments are constructed, these distributions determining the properties of prompt neutrons and gamma rays emitted by these fragments. A new nonevaporation mechanism of third-particle production in ternary fission is proposed. This mechanism involves transitions of third particles from the cluster states of the fissile-nucleus neck to high-energy states under effects of the shake-off type that are due to the nonadiabatic character of nuclear collective deformation motion.

Authors:
 [1]
  1. Voronezh State University, Universitetskaya pl. 1, Voronezh, 394693 (Russian Federation)
Publication Date:
OSTI Identifier:
20692917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 68; Journal Issue: 12; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 2030-2041 (No. 12, 2005); DOI: 10.1134/1.2149077; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; AXIAL SYMMETRY; CORRELATIONS; DEFORMED NUCLEI; DISTRIBUTION; FISSION FRAGMENTS; FISSION PRODUCTS; GAMMA RADIATION; NUCLEAR DEFORMATION; PHOTON EMISSION; PROMPT NEUTRONS; QUANTUM MECHANICS; SCISSION-POINT MODEL; SPIN; SPONTANEOUS FISSION; SUPERFLUIDITY; TERNARY FISSION; THERMODYNAMIC PROPERTIES

Citation Formats

Kadmensky, S.G. Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei. United States: N. p., 2005. Web. doi:10.1134/1.2149077.
Kadmensky, S.G. Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei. United States. doi:10.1134/1.2149077.
Kadmensky, S.G. Thu . "Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei". United States. doi:10.1134/1.2149077.
@article{osti_20692917,
title = {Quantum and Thermodynamic Properties of Spontaneous and Low-Energy Induced Fission of Nuclei},
author = {Kadmensky, S.G.},
abstractNote = {It is shown that A. Bohr's concept of transition fission states can be matched with the properties of Coriolis interaction if an axisymmetric fissile nucleus near the scission point remains cold despite a nonadiabatic character of nuclear collective deformation motion. The quantum and thermodynamic properties of various stages of binary and ternary fission after the descent of a fissile nucleus from the outer saddle point are studied within quantum-mechanical fission theory. It is shown that two-particle nucleon-nucleon correlations--in particular, superfluid correlations--play an important role in the formation of fission products and in the classification of fission transitions. The distributions of thermalized primary fission fragments with respect to spins and their projections onto the symmetry axis of the fissile nucleus and fission fragments are constructed, these distributions determining the properties of prompt neutrons and gamma rays emitted by these fragments. A new nonevaporation mechanism of third-particle production in ternary fission is proposed. This mechanism involves transitions of third particles from the cluster states of the fissile-nucleus neck to high-energy states under effects of the shake-off type that are due to the nonadiabatic character of nuclear collective deformation motion.},
doi = {10.1134/1.2149077},
journal = {Physics of Atomic Nuclei},
number = 12,
volume = 68,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 2005},
month = {Thu Dec 01 00:00:00 EST 2005}
}